Use ISO8601 format instead of raw Unix Epoch

[puffyCid]

What new feature do you think would be cool to add to artemis?
Currently artemis outputs all timestamps to UNIXEPOCH seconds. This not really useful for when reviewing data.
Instead, it would probably be nice to output to ISO8601 format directly (YYYY-MM-DDTHH:mm:ss)

Describe the solution you'd like
Output to ISO8601 instead of seconds

Additional context
Users can already do this in the JS runtime, but this would be nice for users who just use the cli tool or TOML files